1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <memory>
10
11// unique_ptr
12
13// template <class T, class D>
14// constexpr bool operator==(const unique_ptr<T, D>& x, nullptr_t) noexcept; // constexpr since C++23
15// template <class T, class D>
16// bool operator==(nullptr_t, const unique_ptr<T, D>& y) noexcept; // removed in C++20
17// template <class T, class D>
18// bool operator!=(const unique_ptr<T, D>& x, nullptr_t) noexcept; // removed in C++20
19// template <class T, class D>
20// bool operator!=(nullptr_t, const unique_ptr<T, D>& y) noexcept; // removed in C++20
21// template <class T, class D>
22// constexpr bool operator<(const unique_ptr<T, D>& x, nullptr_t); // constexpr since C++23
23// template <class T, class D>
24// constexpr bool operator<(nullptr_t, const unique_ptr<T, D>& y); // constexpr since C++23
25// template <class T, class D>
26// constexpr bool operator<=(const unique_ptr<T, D>& x, nullptr_t); // constexpr since C++23
27// template <class T, class D>
28// constexpr bool operator<=(nullptr_t, const unique_ptr<T, D>& y); // constexpr since C++23
29// template <class T, class D>
30// constexpr bool operator>(const unique_ptr<T, D>& x, nullptr_t); // constexpr since C++23
31// template <class T, class D>
32// constexpr bool operator>(nullptr_t, const unique_ptr<T, D>& y); // constexpr since C++23
33// template <class T, class D>
34// constexpr bool operator>=(const unique_ptr<T, D>& x, nullptr_t); // constexpr since C++23
35// template <class T, class D>
36// constexpr bool operator>=(nullptr_t, const unique_ptr<T, D>& y); // constexpr since C++23
37// template<class T, class D>
38// requires three_way_comparable<typename unique_ptr<T, D>::pointer>
39// constexpr compare_three_way_result_t<typename unique_ptr<T, D>::pointer>
40// operator<=>(const unique_ptr<T, D>& x, nullptr_t); // C++20
41
42#include <cassert>
43#include <cstddef>
44#include <memory>
45
46#include "test_macros.h"
47#include "test_comparisons.h"
48
49TEST_CONSTEXPR_CXX23 bool test() {
50 if (!TEST_IS_CONSTANT_EVALUATED) {
51 AssertEqualityAreNoexcept<std::unique_ptr<int>, nullptr_t>();
52 AssertEqualityAreNoexcept<nullptr_t, std::unique_ptr<int> >();
53 AssertComparisonsReturnBool<std::unique_ptr<int>, nullptr_t>();
54 AssertComparisonsReturnBool<nullptr_t, std::unique_ptr<int> >();
55#if TEST_STD_VER >= 20
56 AssertOrderReturn<std::strong_ordering, std::unique_ptr<int>, nullptr_t>();
57 AssertOrderReturn<std::strong_ordering, nullptr_t, std::unique_ptr<int>>();
58#endif
59 }
60
61 const std::unique_ptr<int> p1(new int(1));
62 assert(!(p1 == nullptr));
63 assert(!(nullptr == p1));
64 // A pointer to allocated storage and a nullptr can't be compared at compile-time
65 if (!TEST_IS_CONSTANT_EVALUATED) {
66 assert(!(p1 < nullptr));
67 assert((nullptr < p1));
68 assert(!(p1 <= nullptr));
69 assert((nullptr <= p1));
70 assert((p1 > nullptr));
71 assert(!(nullptr > p1));
72 assert((p1 >= nullptr));
73 assert(!(nullptr >= p1));
74#if TEST_STD_VER >= 20
75 assert((p1 <=> nullptr) == std::strong_ordering::greater);
76 assert((nullptr <=> p1) == std::strong_ordering::less);
77#endif
78 }
79
80 const std::unique_ptr<int> p2;
81 assert((p2 == nullptr));
82 assert((nullptr == p2));
83 assert(!(p2 < nullptr));
84 assert(!(nullptr < p2));
85 assert((p2 <= nullptr));
86 assert((nullptr <= p2));
87 assert(!(p2 > nullptr));
88 assert(!(nullptr > p2));
89 assert((p2 >= nullptr));
90 assert((nullptr >= p2));
91#if TEST_STD_VER >= 20
92 assert((p2 <=> nullptr) == std::strong_ordering::equivalent);
93 assert((nullptr <=> p2) == std::strong_ordering::equivalent);
94#endif
95
96 const std::unique_ptr<int[]> p3(new int[1]);
97 assert(!(p3 == nullptr));
98 assert(!(nullptr == p3));
99 // A pointer to allocated storage and a nullptr can't be compared at compile-time
100 if (!TEST_IS_CONSTANT_EVALUATED) {
101 assert(!(p3 < nullptr));
102 assert((nullptr < p3));
103 assert(!(p3 <= nullptr));
104 assert((nullptr <= p3));
105 assert((p3 > nullptr));
106 assert(!(nullptr > p3));
107 assert((p3 >= nullptr));
108 assert(!(nullptr >= p3));
109#if TEST_STD_VER >= 20
110 assert((nullptr <=> p3) == std::strong_ordering::less);
111 assert((p3 <=> nullptr) == std::strong_ordering::greater);
112#endif
113 }
114
115 const std::unique_ptr<int[]> p4;
116 assert((p4 == nullptr));
117 assert((nullptr == p4));
118 assert(!(p4 < nullptr));
119 assert(!(nullptr < p4));
120 assert((p4 <= nullptr));
121 assert((nullptr <= p4));
122 assert(!(p4 > nullptr));
123 assert(!(nullptr > p4));
124 assert((p4 >= nullptr));
125 assert((nullptr >= p4));
126#if TEST_STD_VER >= 20
127 assert((p4 <=> nullptr) == std::strong_ordering::equivalent);
128 assert((nullptr <=> p4) == std::strong_ordering::equivalent);
129#endif
130
131 return true;
132}
133
134int main(int, char**) {
135 test();
136#if TEST_STD_VER >= 23
137 static_assert(test());
138#endif
139
140 return 0;
141}
142

source code of libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/cmp_nullptr.pass.cpp